Modulating pulsator



Sept. 22, 1953 R. L. COCKMAN MODULATING PULSATOR Filed Jan. 22, 1951INVENTOR, HaJ u/z .L. Goa/imam,

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Patented Sept. 22, 1953 UNITED STATES PATENT OFFICE MODULATIN G PULSATORRalph L. Cockman, High Point, N. 0. Application J anuary 22, 1951,Serial N 0. 207,159

1 Claim. 1

This invention relates to a modulating pulsator for a humidifier system.

An object of this invention is to control a fixed cycle operation ofvaried duration.

Another object of this invention is to produce a more uniform condition,and the ability to increase or decrease the amount of water addedautomatically to the humidifier system.

With the foregoing and other objects in view, this invention comprisescertain novel constructions, combinations, and arrangements of parts aswill be hereinafter fully described, illustrated in the accompanyingdrawings, and more particularly pointed out in the appended claim.

In the drawings:

Figure l is a view in front elevation of a mechanism constructed inaccordance with the present invention.

Figure 2 is a vertical, sectional view, taken on line 2-2, Fig. l, andlooking in the direction of the arrows.

Figure 3 is a vertical, sectional view, taken on line 3-3, Fig. l, andlooking in the direction of the arrows.

Referring to the drawings, in which the preferred embodiment of thisinvention is illustrated, I designates the casing. A bracket 2 isprovided with flanges 3, Fig. l, which have elongated slots 4 that havescrews 5 therein; these screws are secured to the casing I. The bracket2 is therefore vertically adjustable upon the casing I. An electricmotor 6 is provided with ears I, and extending through these ears arescrews 8, whereby the motor is secured to the bracket 2. The motor 6 isprovided with a circular eccentric cam 9.

A switch supporting arm I is mounted on screw II, Fig. 3. This screw IIextends into screw support I2, which support is secured by screw I3 tothe inner face of the back of casing I The arm I0 is of substantiallyU-shape in cross section. By means of screw I4, Fig. l, a switch I issecured within the arm I0. This switch I5 is provided with a springyswitch trigger I5 and on trigger I5 is a shoe I6. The shoe I6 is adaptedto engage cam 9, as hereinafter described.

A bolt-like pin I'I extends through the bottom of casing I and is heldin place by means of lock nuts I8. On the pin I1 is a coil spring I9.The lower end of coil spring I9 is seated on a bushing 20, and the upperend of spring I9 is seated on bushing 2|, Fig. 2, within the U-shapedarm III. The upper end of the bolt-like pin I'I extends through thesupporting arm II), as shown. On

the bolt-like pin I! is an adjusting nut 22, bearing against the bushing20. A lock nut 23 is against the nut 22, whereby the tension of the coilspring I9 is retained fixed, after being adjusted.

A housing 24 is secured to the top of the casing I and this housingcontains a bellows (not shown). A lunger 25 extends from the bellowsinto the casing I, directly above the switch trigger I5 Therefore, whenthe bellows in housing 24 causes the plunger 25 to move downwardly, thepressure is applied to the arm I0, causing the switch trigger I5 to movedownwardly, whereby shoe I6 presses upon the cam 9.

Lead wires 26, Fig. 1, are connected to the motor and lead wires 2'! areconnected to the switch I5, and lead wires 28 are connected to theelectrically operated three-way solenoid valve 29; this solenoid valveis attached to one side of the casing I, as shown. By means of theselead wires, the dif-- ferent elements of this mechanism are suppliedwith the needed electric current. Of course, these lead wires are incircuit with a suitable source of electricity.

The modulating pulsator is a device to control a fixed cycle operationof varied duration. A normally opened circuit will operate as follows:The eccentric cam 9 is driven by the motor 5 at a predetermined speed R.P. M. With no air pressure on the bellows in housing 24, the spring I9will move switch arm I0, causing switch I5 to move, which in turn willtake switch trigger I5 and cam shoe I6 out of range of cam 9, causingelectrical contact in the switch to stay open. On application of airpressure to the bellows in housing 24, the bellows plunger 25 pushesdown on arm I0 to balance point with loading spring I9. This puts switchtrigger I5 in contact with eccentric cam 9, tripping switch I5 andmaking electrical contact for a given part of cam cycle, for instance,one-third of cycle. Or a further increase of air pressure on the bellowswill cause a new position to be taken by trigger I5 through therefore,reserve the right to make such changes or alterations as shall fairlyfall within the scope of the appended claim.

What I claim is:

In a modulating pulsator, a housing, an arm of U-shaped cross section insaid housing, a pivotal mounting for one end of said arm, a compressionspring abutting the other end of said arm and seating within the bightthereof, a pressureresponsive lun er abutting said arm at anintermediate point on the side opposite said spring, a contact carriedby said arm on the side oppm site said plunger, an eccentric rotatablymounted in said housing adjacent said contact, said eccentric comprisinga second contact, electrical means associated with said first and secondcontacts whereby upon engagement of said first com tact with saideccentric a circuit is closed, means for rotating said eccentric at aconstant speed,

and means for varying the pressure exerted by said spring whereby tovary the pressure required to be exerted by said plunger to maintainsaid first contact in engagement with said eccentric for a predeterminedportion of each arc of rotation thereof.

RALPH L. CQCKMAN.

'References Cited in theme-of" thispatent UNITED STATES PATENTS VarneyNov. 22, 1949

